Battery Light B2910

[ChrisC]

The battery light comes on when I start the tractor. As I crank up the RPMs, it begins to dim and goes out at around 2,000 RPM.

I tightened the belt, visually inspected the wiring, removed and cleaned a few connections. All looks good to my untrained eye. What are my next steps?

Thanks,
Chris

 

[Roadworthy]

It should go out a little above idle. Try monitoring the generator output voltage as various engine speeds. It sounds like the brushes may be worn out. Replacing them is generally a simple process. Another option is a defective voltage regulator but I'd start with the brushes.

 

[Richard001]

Assuming that your battery is the standard 12V wet cell, a proper working alternator or generator should be putting about 14.5 volts into the battery, measured at the battery, with the engine running at a fast idle or just above idle.

Richard

 

[ChrisC]

Checked with a multimeter. Battery reads around 12v. With tractor running, it’s basically the same reading.

When I rev up the engine to 2,000 RPM the light goes out, but the reading at the battery is the same.

Next steps? Is it most likely the alternator?

 

[ChrisC]

It should go out a little above idle. Try monitoring the generator output voltage as various engine speeds. It sounds like the brushes may be worn out. Replacing them is generally a simple process. Another option is a defective voltage regulator but I'd start with the brushes.

Thanks - Where would I monitor the generator output?

 

[anomad]

Could it be as simple as the battery not taking a charge? Posting/thinking out loud.

 

[number two]

Wouldn't the B2910 have the dynamo?